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Import of the watch repository from Pebble

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Matthieu Jeanson 2024-12-12 16:43:03 -08:00 • committed by Katharine Berry
commit 3b92768480
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88
third_party/nanopb/tests/fuzztest/generate_message.c vendored Normal file
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/* Generates a random, valid protobuf message. Useful to seed
* external fuzzers such as afl-fuzz.
*/
#include <pb_encode.h>
#include <pb_common.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "alltypes_static.pb.h"
#include "random_data.h"
#ifndef FUZZTEST_BUFSIZE
#define FUZZTEST_BUFSIZE 4096
#endif
/* Check that size/count fields do not exceed their max size.
* Otherwise we would have to loop pretty long in generate_message().
* Note that there may still be a few encoding errors from submessages.
*/
static void limit_sizes(alltypes_static_AllTypes *msg)
{
pb_field_iter_t iter;
pb_field_iter_begin(&iter, alltypes_static_AllTypes_fields, msg);
while (pb_field_iter_next(&iter))
{
if (PB_LTYPE(iter.type) == PB_LTYPE_BYTES)
{
((pb_bytes_array_t*)iter.pData)->size %= iter.data_size - PB_BYTES_ARRAY_T_ALLOCSIZE(0);
}
if (PB_HTYPE(iter.type) == PB_HTYPE_REPEATED)
{
*((pb_size_t*)iter.pSize) %= iter.array_size;
}
if (PB_HTYPE(iter.type) == PB_HTYPE_ONEOF)
{
/* Set the oneof to this message type with 50% chance. */
if (rand_word() & 1)
{
*((pb_size_t*)iter.pSize) = iter.tag;
}
}
}
}
static void generate_message()
{
alltypes_static_AllTypes msg;
alltypes_static_TestExtension extmsg = alltypes_static_TestExtension_init_zero;
pb_extension_t ext = pb_extension_init_zero;
static uint8_t buf[FUZZTEST_BUFSIZE];
pb_ostream_t stream = {0};
do {
rand_fill((void*)&msg, sizeof(msg));
limit_sizes(&msg);
rand_fill((void*)&extmsg, sizeof(extmsg));
ext.type = &alltypes_static_TestExtension_testextension;
ext.dest = &extmsg;
ext.next = NULL;
msg.extensions = &ext;
stream = pb_ostream_from_buffer(buf, sizeof(buf));
} while (!pb_encode(&stream, alltypes_static_AllTypes_fields, &msg));
fwrite(buf, 1, stream.bytes_written, stdout);
}
int main(int argc, char **argv)
{
if (argc < 2)
{
fprintf(stderr, "Usage: generate_message <seed>\n");
return 1;
}
random_set_seed(atol(argv[1]));
generate_message();
return 0;
}